Which country has the longest combined land border?

Russia
United States
Brazil
China
China's combined land border measures 22,117 km (13,743 mi) from the mouth of the Yalu River to the Gulf of Tonkin. China borders 14 nations, more than any other country except Russia, which also borders 14.
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Answers by country

Russia
United States
Brazil
China
answers
flagIndia
34%
21%
0%
43%
41
flagthe United Kingdom
46%
19%
3%
29%
103
flagGreece
37%
33%
0%
29%
24
flagPoland
54%
11%
6%
27%
13125
flagUnknown
50%
15%
7%
26%
26
flagAustralia
55%
15%
0%
25%
20
flagGermany
58%
18%
2%
20%
48
flagthe United States
51%
23%
5%
18%
204
flagthe Netherlands
43%
25%
12%
18%
16
flagItaly
68%
18%
0%
12%
16